Cylinder grinder



A Jan. 28, 1930. J. JOHNSON CYLINDER GRINDER Filed mayy 17. 192e www vimm w l INVENTOR J. ./af/Ms'o/v BY mw, v6

ATTORNEYS Patented Jan. 28, 1930 JOHN JOHNSON, OF PERCIVAL, SASKATCHEWAN, CANADA CYLNDER GRINDER Application nea May i7,

My invention relates to improvements in cylinder grinders, and it consists in the combinations, constructions, and arrangements herein described and claimed.

An object of my invention is to provide a cylinder grinder which is especially adapted to grind automobile motor cylinders'without the necessity of removing the motor from the chassis.

A further object of my invention is to provide a device of the type described which is compact, light in weight, and which can be manufactured at a low cost.

A further object of my invention ist provide a device of the type described which can be secured to the engine block after the cylinder head, the pistons, the connecting rods, and the crank case have been removed.

i A further object of my invention is to provide a device of the type described which' employs means forv automatically centering the grinding mechanism within the cylinder.v Other objects and advantages will appear in the following specification, and the novell features of the invention will be particularly pointed out in the appended claims.

My invention is illustrated in the accompanying drawings, forming part of this application, in which Figure l is a front elevation of the device as applied to a motor cylinder,

Figure 2 is a sectional view showing the raising and lowering mechanism,

Figure 3 is a sectional view'of a portion of the device,

Figure 4 is a sectional view of the mainv shaft rotating mechanism,

Figure 5 is a. sectional view of the main shaft centering mechanism,

Figure 6 is a fragmentary view of the device, i

Figure 7 is a section substantially along the line 7-7 of Figure 4,

' Figure 8V is an enlarged sectional view of the grinding wheel adjusting mechanism, and

Figure 9 is a sectional view of the automatic centering mechanism.

In carrying out my invention, I make use of an engine block 1 comprising a cylinder 2 and threaded openings 3 and 4.

1926. Serial N0.'109,G81.

1 provide -a frame comprising a base 5 and vertically extendingy rods 6 threaded for a portion oftheir length, as shown at 7 and disposed within threaded openings 8 in the base. The upper ends of the rods 6 are threaded for a portion of their length, as shown 'at 9, and disposed within threaded openings l() within a support 11.

The base 5 is provided with an annular recess 12 which is yadapted to receive a turntable 13 and a ball bearing 14. A main shaft 15 is disposed within the turntable 13 and adjustablyheld in place by means of a retainerV ring 16 and 'set screws 17 The turntable 13 is provided with an integral worm gear 18.

' A shaft 19 having an integral worm 20 is rotatably mounted upon the base 5, the worm" being in mesh with the worm gear 18. A

hand wheel 21 is rigidly mounted upon the shaft 1Q and provided with teethy 22 on@ the periphery thereof. A motor 23 has a relatively small gear 24 in mesh with the teeth 22. Electrical conductors 25 extendfrom themo-` tor 23- to a switch 26 which is adjustablyse` cured'toone of therods 6.

A bar 27 which is rectangular in cross section, is pivotally connected at 28 to the up? per portion of the main shaft 15 an-d receivable within a slot 29 within t-he main shaft. The upper portion of the bar 27 is fashioned into a support which is adapted to receive a motor 30. A motor shaft 31 is operatively connectedv to the motor and extends downwardly through a slot 32 within the bar 27, and is provided with a grinding wheel 33 which is removably secured thereto.

The main shaft 15 is provided with an enlarged U-shaped portion 34. A set screw 35 which is provided with a groove 36 is disposed o within the vUshaped portion 34, see Figure 8. A worm gear 37 having a tongue 3S which is slidably disposed within the groove 36 is y positioned within the Ufshaped portion 34. The gear 37 is held in place by means of a cup-shaped retaining screw 39. A rod 40 having a threaded portion 41 is loosely mounted within openings 42 within the U'shaped member 34. The threaded portion 41 is positioned so that the threads thereon will mesh f' with the teeth of the worm gear 37. The rod 40 passes through an opening in the turntable 13 and s provided with a knurled head portion 43. A tension spring 44 is secured at one end to the U-shaped portion 34, and at the other end to the bar 27.

A forked member' 45 straddles the motor 30 and secured at its lowermostends to the main shai't 15. An insulating washer 46 is disposed upon the upper portion of the forked member 45. A current-collecting ring 47 is disposed concentric with the washer 46. A terminal 48 is disposed in connection with the ring 47. A plate 49 is slida.- bly disposed upon the rods 6, and is provided with a stub shaft 50 which operatively connects `the motor 30 with a shaft 51. The shaft 51 is provided with left-hand threads and a groove 52 for its ventire length. A relatively large gea-r 53 having a tongue 54 receivable within the groove 52 is loosely mounted on thethreaded shaft 51. A relatively simili) gear 55 which is internally screwthreaded is disposed upon the threaded shatt 51, A relatively small clutch gear 56 is 1 n mesh with the relatively large gear 53, and 1s loosely mounted upon a shaft 57. A relatively large bevel gear 58 is rigidly mounted on the shaft 57 and is in mesh with the gear 55. A hand-operated pinion 59 is in mesh with the bevel gear 58. An L-shaped bracket 6 0 having openings 61 therein is rigidly secured to the support 11. A clutch 62 is keyed to the shaft 57 and is provided with lugs y6,3 and 64. A clutch lever 65 is pivotalty connected to one of the rods 6, see Figure 1, and is provided with a pin 66 which is adapted to engage with a peripheral groove in clutch 62. The free end of the clutch lever 65 is provided with a projection 67. A hand lever 68 which is pivotally mounted within the support 11 is provided wit-h a roller 69v and a spring 7 0.

The main shaft centering mechanism consists of split cores 71, 72, 73 and 74. The split cores 71 and 72 are provided with semicylindrical recesses 75 for receiving that portion of the main shaft above the U-shaped portion 34. Cutaway portions 76 are provided for receiving the bar 27. An opening 77 is provided in the core 71 for receiving the rod 40. Pins 78 are rigidly disposed in the core 71 their free ends being adapted to be received within openings in the core 72. Openings 7 9 are provided in the cores 71 and 72 for receiving cords 80. ledges 81 are disposed concentric with the cords 89 and have portions which are adapted to be received in the openings 79. The peripheral edge of the cores 71 and 72 is tapered inwardly and provided with tapering lugs 82.

The cores 73 and 74 are provided with semi-cylindrical recesses 83 which are adapted to receive a portion of the main shaft 15 which extends below the U-shaped portion 34. The core 73 is provided with pins 84 which are receivable within openings in the core 74. Spring-pressed pins 85 having eyelets 86 are disposed within the cores 73 and 74. Hooks 87 are rigidly secured to the lower ends of the cords 80 and are adapted to engage with the eyelets 86.

Plates 88 having openinfrs therein are disposed upon the upper surtace of the engine block 1, and are rigidly secured thereto by means of screws 89. The base 5 is adjustably secured to the plates 88 by means of screws 90 which are receivable within slots 91.

Plates 92 are rigidly secured to the lower portion of the engine block 1 by means of screws 93. A cross bar 94 having an adjustable bearing 95 mounted therein is adjustably secured to the plates 92 by means of screws 96 which are receivable within slots 97.

From the foregoing description of the various parts of the device, the operation thereof may be readily understood. In preparing the motor for grinding the cylinders, the cylinder head, the pistons, the connecting rods, and the crank case are iirst removed therefrom. The plates 88 and 92 are then secured in place. The cross bar 94 is placed below the cylinder' which is to be ground, and the screws 96 put in place but leftloose to permit lateral adjustment of the cross bar. The lower end of the main shaft is then passed through the cylinder and through the adjustable bearing 95 until the base 5 rests upon the plates 88. The cores 71, 7.4, 73, and 7.4 are inserted in place, see dotted lines in Figure 1. By pulling upwardly upon the cords 80, the cores are forced into the cylinder, and ly forcing the wedges into the opening 79, .the cords are held taut until the base 5 and the cross bar 94 are rigidly secured in place. The cores may then be removed by first releasing the wedges 81.

The grinding wheel 33 is moved outwardly into engagement with the wall of the evlinder by actuating the rod 40. The device is now in readiness for grinding thc cvlinder. l u

Let us assume that the grinding wheel is positioned adjacent the lower peripheral edge of the cylinder. A current is supplied to the motors 3() and 23. The motor 30 actuates the motor shaft 31 causing the grinding wheel 33 to rotate. The motor 23 actuates the worm 2() causing the main shaft 15 to rotate. It will be observed that the grinding wheel rotated at a relativelv high speed, and at the same time, it is moved-Ain a circuitous path within the cylinder, and grinding the adjacent portion of the cylinder iu its circuitous travel.

The main shaft 15 rotates the threaded rod 51 which is provided' with left-hand threads. During the rotation of the rod 51, see Figure 1, the threads will engage with the threads within the gear 55 and cause the rod 51, the

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I motor 30, the main shaft 15, and the grinding wheel 33 to slowly move upwardly. This operation is continued until the stub shaft 50 strikes the clutch lever 65 and moves the lever and the clutch 62 upwardly until the lever is held by the rollerv 69 on .the hand lever 68, and the clutch 62 is in engagement with the 'gear 56.

By continued rotation of the shaft 51, the gear 53 which is keyed to the shaft will actu# ate the gear 56 Vwhich will in turn actuate the relatively large gear 58 and the relatively small gear 55. 1n this manner, the gear 55 1s rotated at a much greater speed than the shaft 51 and will force the shaft 51, the motor 30, the main shaft 15, and the grinding wheel downwardly. v

In the downward movement, the switch 26 is so positioned upon the rod 6 that when the grinding wheel 33 has reached the desire-d position, the plate 49 will open the switch 26 and cause the main shaft 15 to stop rotating. This is the means for permitting the operator to tell when the grinding wheel has reached its lowermost point of travel. The worm 2O may be actuated by turning the hand lever until the plate 49 has been raised a sufficient distance to again turn the switch 26 on. This operation may be continued un- Y til the cylinder has been ground sufficiently.

During the lateral movement ofthe grinding wheel, the grinding wheel may be forced outwardly as desired by actuating the rod40.

Iclaim: Y

"1. A device of the type described comprising a main shaft having an offset portion and a longitudinally extending groove disposedy therein, a bar disposed in said groove r and having one end pivotally secured to sai-d main 40', shaft, said bar having a longitudinally extending opening therethrough, ashaft extending through said opening,power means disposed upon said bar and operatively con-` nected to one end of said shaft for rotating said shaft, a grinding wheel rigidly mounted upon the other end of said shaft adjacent and partially within the offset portion of said main shaft, said main shaft being adapted to be disposed within a cylinder of a motor i block, a turntable having an opening arranged to receive said main shaft and said bar for holding said main shaft and said bar against rotation with respect thereto, a main frame arranged to rotatably receive said turntable, said main framebeing adapted to be secured to said motor block at one end of said cylinder, an auxiliary frame arranged to be rigidly secured to said motor blockadjacent the other end of said cylinder, said auxiliary frame being arranged to rotatably receive said main shaft, an adjusting screw extending through a threaded opening in the otfsetportion of said main shaft an-d arranged to engage with said bar adjacent the end opposite that of its pivot, a gear argagement with the wall of said cylinder,

and means operatively connected to said turntable for rotating said turntable, said main shaft and said bar for movingsaid grinding wheel in a circuitous path. .v 2. A device of the type described comprisf ing a main shaft having an oHset portion and a longitudinally exten-ding groove disposed therein, a bar disposed in said groove and having one end pivotally secured to said main shaft, said bar having` a longitudinally ex-` tending opening therethrough, a shaft eX- tending through said opening, power means disposed upon said bar and operatively connected to one end of said shaft for rotating said shaft, a grinding wheel rigidly mounted upon the other end of said shaft adjacent and partially within the offset portion of said main shaft, said main shaft being adapted to be disposed within a cylinder of a motor block, a1 turntable having an opening arranged to receive said main shaft and said bar for holding said main shaft and said bar against rotation with respect thereto, a-main frame arranged to rotatably receive said turntable, sai-dmain frame being adapted to be secured to said motor block at one end of said cylinder, an auxiliary frame arranged to be rigidly secured to said motor block adjacent theother end ofsaid cylinder, said auxiliary frame being arranged to rotatably receive said main shaft, an adjusting screw extending through a threaded opening in the offset portion of said main shaft and arranged to engage with said bar adjacent the end opposite that ofr its pivot, ar gear arranged to receive saidadjusting screw, means fory rotating said gearfor moving said adjusting screwfor moving said bar whereby sai-d grinding wheel may be brought into engagement with. the wall of said cylinder, means operatively con-` nected to said turntable for rotating said,k turntable, said main shaft and said bar forv moving said grinding wheel in a circuitous path, a threaded shaft having one end rotatably secured to said main shaft an-d in alignment therewith, and means operatively` lconnected to said threaded shaft for causingy j shaft, said bar havinga longitudinally extending opening therethrough, a shaft extending through said opening, power means disposed upon said bar and operatively con,- nected to one end of said shaft for rotating sald shaft, a grinding wheel rigidly mounted upon tlieother end of said shaft adjacent and partially within the offset portion of said main shaft,said main shaft being adapted to be disposed within a cylinder of a motor block, a turntable having an opening ar,- ranged to receive said main shaft and said bar vfor Vholding said-main shaft and said bar against rotation with respect thereto, a main frame airanged to rotatably receive said turntable, said main frame being adapted to n positethat of its pivot, a gear arranged vto receive said adjusting screw, means for rotating said gear for moving said adjusting screvv for moving said bar whereby said grinding Wheel may be brought into engagement with the Wall of said cylinder, means operatively connected to said turntable for rotating said turntable, said main shaft and said bar for moving said grinding wheel in a circuitous path, a threaded shaft having one end rotatably secured to said main shaft and in alignment therewithI means operatively connected to said threaded shaft for causing longitudinal movement of said main shaft in one direction as said main shaft is rotated, and means for automatically stopping the longitudinal movement of said main shaft and said threaded shaft in one direction.

4. A device of the type described comprising a main shaft having an offset portion and a longitudinally extending groove disposed therein, a bar disposed in said groove and having one end pivotally secured to said main shaft, said bar having a longitudinall;7 cxtending opening therethrough, a shaft extending through said opening, power means disposed upon said bar and operatively connected to one end of said shaft for rotating said shaft, a grinding wheel rigidly mounted upon the other end of said shaft adjacent and partially Within the offset portion of said niain shaft,said main shaft being adapted to be disposed within a cylinder of a lmotor block, a turntable having an opening arranged to receive said main shaft and said bar for holding said main shaftand said bar against rotation with respect thereto, a main frame arranged to rotatably receive said turntable, said main frame being adapted to be secured to said motor block at one end of said cylinder, an auxiliary frame arranged to be rigidly secured to said motor block adjacent tlie other end of said cylinder, said auxiliary frame being arranged to rotatably receive said main shaft, an adjusting screw extending through a threaded opening in the offset portion `of said main shaft and arranged .to engage with said bar adjacent the endopposite that of its pivot, a gear arranged to receive said adjusting screw, means for rotating said gear for moving said adjusting screw for moving said bar whereby said grinding Wheel may be brought into engagement with the wall of said cylinder.` means operatively connected to said turntable for rotating said turntable, said main shaft and said bar for moving said grinding wheel in a circuitous path, a threaded shaft having one end rotatably' secured to said main shaft and in alignment therewith, means operatively connected to said threaded shaft for causing longitudinal movement of said main shaft in one direction as said main shaft is rotated, means lfor automatically stopping the longitudinal movement of said main shaft. and said threaded shaft in one direction, and means operatively connected to said threaded shaft for causing longitudinal movement of said main shaft and said threaded shaft in the opposite direction.

5. In a device of the type described. a niain shaft having an otl'set portion and a longitudinally extending groove disposed therein, a bai' disposed in said groove and having one end pivotally secured to said main shaft at one end thereof, a motor mounted upon the end of said bar adjacent the pivotal end thereof, said bar rhaving a longitudinally extending opening therethrough, a shaft for said motor extending through said opening, and a grinding wheel secured to the other end of said inotor shaft and extending into said offset portion of said inain shaft, said main shaft being adapted to be rotated for swinging said grinding wheel in a circuitous path, said motor being adapted to rotate said grinding wheel through said motor shaft.

In a device of the type described, a main shaft having an offset portion and a longitudinally extending groove disposed therein. a bar disposed in said groove and having one end pivot-a ly secured to said inain shaft at one end thereof, a motor mounted upon the end of said bar adjacent the pivotal end thereof` said har having a longitudinally extending opening therethrough, a shaft for said motor extending through said opening, a grinding wheel secured to the other end of said motor shaft and extending into said offset portion of said main shaft, said main shaft being adapted to be rotated for swinging said grinding wheel in a circuitous path, said inotor being adapted to rotate said grinding wheel through said motor shaft, and means carried by said main shaft. for moving said bar about yits pivot for moving said grinding wheel toward or away from said inain shaft.

7. In a. device of the type described. a main shaft having an offset portion and a longitudinally extending groove disposed therein. a bar disposed in said groove and having one end pivotally secured to said main shaft at one end thereof, a motor mounted upon the end of said bar adjacent the pivotal end thereof, said bar having a longitudinally extending opening therethrough, a shaft for said motor extending through said opening` a grinding wheelvsecured to the other end of said motor shaft and extending into said oli set portion of said main shaft, said main shaft being adapted to be rotated for swinging said grinding wheel in a circuitous path, said motor being adapted to rotate said grinding wheel through said motor shaft, means carried by said main shaft'for moving said bar about its pivot for moving said grinding wheel toward or away from said main shaft, said bar-moving means comprising a threaded rod disposed in engagement with said bar, and means for rotating said threaded rod.y

8. In a device of the type described, a main shaft having an offset portion and a longitudinally extending groove disposed therein, a bar disposed in said groove and having one end pivotally secured to said main shaft at one end thereof, a motor mounted upon the end of said bar adjacent the pivotal end thereof, said bar having a longitudinally extending opening therethrough, a shaft for said motor extending through said opening, a grinding wheel secured to the other end of said motor shaft and extending into said offset portion of said main shaft, said main shaft being adapted to be rotated for swinging said grinding wheel in a circuit-ous path, said motor being adapted to rotate said grinding wheel through said motor shaft, means carried by said main shaft for moving said bar about its pivot for moving said grinding wheel toward or away from said main shaft, said bar-moving means comprising a threaded rod, a gear disposed concentric with said rod and operatively connected Y thereto, and means for rotating said gear for rotating said rod for moving said bar.

JOHN JoHNsoN. 

